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Inverter device

Inactive Publication Date: 2015-10-15
TOYOTA IND CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The objective of this patent is to create an inverter device that can quickly heat up a capacitor at a low temperature.

Problems solved by technology

However, if a great current is supplied to the inverter device under a low-temperature environment as the warm-up control, the voltage drop amount is undesirably increased since the internal resistance of the capacitor is increased.
If the voltage drop amount is great, the system becomes unstable, and the microcomputer of the inverter device may be reset.
When such a control is performed, the current value of the warm-up control is limited even if deterioration of the capacitor has not progressed, and the warm-up control of the capacitor takes a long time.

Method used

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Embodiment Construction

[0013]An inverter device according to one embodiment of the present invention will now be described with reference to the drawings. The inverter device is mounted on a forklift and activates a vehicle driving electric motor and a cargo handling electric motor of the forklift. The forklift is a battery-operated forklift. The forklift is driven by the vehicle driving electric motor and performs cargo handling with the cargo handling electric motor. That is, when an operator operates an accelerator pedal in a state in which the key is turned on, the vehicle driving electric motor is activated to drive the forklift forward or rearward. When the operator manipulates the lift lever, the cargo handling electric motor is activated to lift or lower the fork to handle a cargo. Such a forklift may be used in a cold storage in which the ambient temperature is less than or equal to −40° C.

[0014]As shown in FIG. 1, an inverter (three-phase inverter) 10 includes an inverter circuit 20, a drive cir...

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Abstract

An inverter device includes an inverter circuit, which has switching elements in a bridge connection, a capacitor, which is connected in parallel to the input side of the inverter circuit, a control device, which controls the inverter circuit, a temperature detector, which detects the temperature of the capacitor, a degree-of-deterioration determiner, which determines the degree of deterioration of the capacitor, and a warm-up controller. When the temperature of the capacitor detected by the temperature detector is lower than a prescribed temperature, the warm-up controller controls the switching elements of the inverter circuit to supply a direct current set based on the degree of deterioration and the temperature of the capacitor to the coil of an electric motor connected to the output side of the inverter circuit.

Description

FIELD OF THE INVENTION[0001]The present invention relates to an inverter device.BACKGROUND OF THE INVENTION[0002]Inverter devices that drive an electric motor include a capacitor as a component. The internal resistance of the capacitor increases under a low-temperature environment. If a great input is applied to such an inverter device from the electric motor during, for example, regenerating operation, an internal voltage is increased and internal elements of the inverter device may be destroyed. To avoid such a situation, the temperature of the capacitor needs to be quickly increased to reduce the capacitor internal resistance. For this reason, warm-up control is performed in which, during a startup, an electric current is applied for a few seconds without the electric motor being rotated, and thus generated heat is used to increase the temperature of the capacitor.[0003]For example, Patent Document 1 discloses a method for controlling an electric motor that increases the temperat...

Claims

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Application Information

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IPC IPC(8): H02M1/36H02M7/44
CPCH02M1/36H02M7/44B60L15/007B60L2200/42B60L2210/30B60L2210/40B60L2210/42B60L2240/36B60L2240/525B60L2240/526B60L2240/529B60L2240/549B60L50/51H02M1/32H02M7/5375H02M7/5387H02P27/06H02M1/327Y02T10/64Y02T10/70Y02T10/72Y02P90/60B60L3/00B60L3/0046
Inventor YAMAGAMI, TOMOHIRONAGASE, TOSHIAKIKANIE, NAOHITOOHBA, TOMOHIRO
Owner TOYOTA IND CORP
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